<iostream>

Library:  Input/output

Header

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The header <iostream> is part of the Input/output library of the C++ Standard Library. It declares the eight standard iostream objects: cin, cout, cerr, clog, wcin, wcout, wcerr, and wclog.

namespace std {
  extern istream cin;
  extern ostream cout;
  extern ostream cerr;
  extern ostream clog;

  extern wistream wcin;
  extern wostream wcout;
  extern wostream wcerr;
  extern wostream wclog;
}

cin, cout, cerr, clog, wcin, wcout, wcerr, wclog

ISO/IEC 14882:1998 -- International Standard for Information Systems --Programming Language C++, Section 27.3